DeVere Insulation’s Post

This might be contrary to popular opinion! We’ve already been through a significant round of review with this clause, and we know for a fact that these issues were addressed last time. While we love selling our energy modelling services (and yes, it’s a superior method compared to the schedule method), here’s the reality: neither of these methods will matter if they aren’t balanced against other critical aspects of building physics—like airtightness, ventilation, and internal moisture management. Many colleagues have already pointed out the diminishing returns of increasing insulation values for floors, walls, and roofs in different climate zones. Why can’t we reflect this in a more balanced schedule method? One that also incorporates a minimum standard for airtightness and ventilation combined, ensuring these are not just theoretically designed but actually commissioned in real life. And while we’re at it, let’s add an acceptable solutions catalog for E3 (internal moisture) to cover the most common construction systems that are in fact subject to moisture issues - because accessible surfaces and water splash alone is not cutting it. A holistic approach like this would move us closer to better-performing buildings without overcomplicating compliance. Have your say! https://lnkd.in/gfrwvAAB

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H1 changes are out for consultation. I've read through the consultation document and recommend skipping to pages 39 and 65 for the summary and then going back into the details. Overall pretty gutsy. Largest change is to REMOVE the schedule method while keeping the Calculation and Modeling methods (and the reference building). Most politically ugly change is to require the use of 38% timber in wall R-value calculations "unless a designer can demonstrate that a lower framing fraction is justified". This will lower the reference R-value from R2 to R1.6 for the reference building. Same result with no construction changes but the first step to fixing a problem is recognizing that you have one. Heaps of little fixes/clarifications and removal of some common 'cheats' used to make poor buildings pass H1. Like defining the reference building SHGC for glazing and reducing internal loads by nearly 50% to better match reality. I was a bit disappointed that the document pointed out that more research shows overheating is not caused by insulation but no requirements were suggested to address this. I yelled boo when I read the bit about using overall internal dimensions to measure areas for H1. Understand why (to control window %) but this means when we finally move to predictive thermal models for code compliance we will need to use lots of thermal bridge calculations - just like they do in the UK today. What surprised you? Download documents to read and review here: https://lnkd.in/gd4BTDs2